Question about your Sweet Tea

I most mornings stop at QT and grab an XL tea which typically lasts me all day.

Some days they taste better, others they taste burnt. Now with the digital screen dispensers, its harder to find stores with good tea.

Curious, do you have a recipe you follow or is the store employee experience on how its made?

Are the digital dispensers bag made or syrup made? They always taste different

There days I'll go to couple or few stores trying to find a good tea before giving up.

Thanks